SOFC Stack Corrugated Separator Plate Gas Distribution
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Solution Overview
Problem
SOFC cell stacks face limitations in capacity, complexity, sealing issues due to multiple components, and increased production costs, along with inefficiencies in gas distribution and electrical junctions, leading to potential leaks and reduced operational reliability.
Innovation Solution
The solution involves arranging anode and cathode openings perpendicularly to minimize flow resistance, using corrugated separator plates to eliminate redundant components, and optimizing gas flow direction for co-flow, which simplifies sealing and reduces the number of electrical junctions, while the corrugation supports packing pressure for effective sealing and improved gas distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple components (slot plates, expanded metal, auxiliary plates) are used to provide gas ducts and current collection, then gas distribution and electrical functions are achieved, but the number of components increases leading to higher production costs and sealing complexity
Solution Approach 1:
The patent combines multiple separate components (slot plates, expanded metal, auxiliary plates) into a single integrated separator plate structure. The corrugated separator plate simultaneously provides gas distribution channels, current collection paths, and structural support, eliminating the need for multiple discrete components and reducing assembly complexity
Solution Approach 2:
The separator plate is designed to perform multiple functions simultaneously: it acts as a gas distribution element, a current collector, and a structural separator between anode and cathode. The corrugated structure provides both mechanical support and integrated fluid channels, making the single component universal in its functionality
2Reliability
If multiple components are stacked on top of one another to provide gas ducts and current collection, then gas distribution is achieved, but sealing becomes difficult due to accumulated tolerances
Solution Approach 1:
By merging multiple components into a single corrugated separator plate, the patent reduces the number of interfaces between parts. Fewer interfaces mean fewer sealing locations, thereby reducing the cumulative effect of tolerances and improving overall sealing reliability
Solution Approach 2:
The corrugated structure segments the gas flow paths into separate channels while maintaining a single continuous plate structure. This segmentation of flow paths within a unified structure allows for better tolerance control compared to stacking multiple separate components
3Productivity
If flat separator plates with multiple components are used, then gas ducts can be provided, but the cell unit becomes less compact and requires more electrical junctions
Solution Approach 1:
The patent merges the current collection function into the corrugated separator plate itself, eliminating the need for separate current collector components. This integration reduces the number of electrical junctions and connections required, improving electrical performance and reducing resistance
4Productivity
If anode and cathode openings are arranged perpendicularly with large cross sections to minimize flow resistance, then gas distribution is improved, but the cell structure becomes more complex
Solution Approach 1:
The patent uses corrugated (curved/waved) geometry in the separator plate to create three-dimensional gas flow channels. This curved structure allows for optimized gas distribution paths with large effective cross-sections while maintaining a relatively simple planar plate form factor, avoiding the need for complex multi-component assemblies
Data Source
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AI summary
SOFC cell unit in which a separator plate provided with a corrugation is fitted and bears directly against the anode and cathode, respectively. Anode gas and cathode gas preferably move in the same direction and anode gas is supplied from a number of anode gas supply openings extending through a cell stack. These openings are situated on the side parallel to the direction of the ducts formed by the corrugation. Cathode gas can be fed directly into the corrugation. In this way, it is possible to produce a highly efficient cell and an associated compact cell stack in a simple manner.